.audio{
    position: fixed;
    top:10px;
    right:10px;
    z-index:100;
}
.audio_sprite{
    background: url("../img/sprite02.png") no-repeat;
}
.audio_open{
    width: 32px;
    height:42px;
    background-position: -34px 0;
    display: none;
}
.audio_close{
    width: 35px;
    height:42px;
    background-position: 1 0;
    display: none;
}